Electric Control Valve Manufacturer in India

Electric control valves regulate process variables such as flow, pressure, temperature or liquid level by positioning the valve trim in response to a control signal. An electric actuator positions the valve according to the control signal received from the automation system. Selection should consider required flow capacity (Cv/Kv), inlet and outlet pressure, temperature, valve size, trim design, flow characteristic and actuator requirements.

Electric Control Valve Configurations:

The available electric control valve designs include different body and trim arrangements for throttling, process regulation and shut-off where required.

• Electric Single Seat Control Valve – Used for throttling and flow regulation where the selected seat and trim arrangement provides the required shut-off performance.

• Electric O-Type Shutoff Control Valve – Quarter-turn shut-off configuration used where automated isolation is required, with control capability depending on the selected valve and actuator arrangement.

• Electric Globe Control Valve – Provides continuous flow adjustment through linear stem movement.

• Electric Double Seat Control Valve – Uses a double-seat arrangement to reduce unbalanced fluid forces in suitable control applications.

• Electric Cage Type Control Valve – Provides guided trim movement and defined flow characteristics.

• Electric 3 Way Control Valve – Used for mixing or diverting process streams through three flow paths.

Flow Control and Trim Selection:

Electric control valve performance depends on the selected trim, flow characteristic and operating conditions.

• Single Seat Trim: Suitable for general throttling and applications requiring tight shut-off.

• Double Seat Trim: Suitable where reduced unbalanced forces are required.

• Cage Guided Trim: Provides stable plug guidance and can support defined flow characteristics.

• Three-Way Trim: Used for mixing or diverting service.

• Shut-Off Trim: Selected where automated isolation is required alongside control functions.

• Flow Characteristics: Linear and equal-percentage characteristics are commonly selected for modulating control, while quick-opening characteristics are used where rapid change in flow is required rather than normal continuous throttling.

Electric Actuator and Control Signals:

Electric actuators provide controlled valve positioning and can be integrated with PLC, DCS and other automation systems.

• Actuator Type: Linear or quarter-turn electric actuator according to the selected Control Valve design.

• Control: Primarily modulating for process regulation; on-off operation where required by the selected valve configuration.

• Signal: 4–20 mA or other specified control signals.

• Voltage: Selected according to actuator model and available power supply.

• Frequency: 50 Hz or 60 Hz according to actuator specification.

• Phase: Single-phase or three-phase according to actuator design.

• Position Feedback: Available for remote monitoring of valve position according to the selected actuator/control package.

• Manual Override: Available on suitable actuator configurations.

• Actuator Ambient Temperature: According to actuator model, enclosure, accessories and installation environment.

Electric Control Valve Technical Details:

Materials and Trim Materials:

Material selection depends on the process medium, temperature, pressure and corrosion conditions.

• Carbon Steel: Used for general industrial and process applications.

• Low Temperature Carbon Steel: Selected for reduced-temperature service.

• Stainless Steel: Used where improved corrosion resistance is required.

• Duplex Stainless Steel: Suitable for selected chloride-containing environments.

• Super Duplex Stainless Steel: Used for more demanding corrosive service.

• Nickel Alloys: Selected by specific alloy grade according to process chemistry, temperature and corrosion conditions.

• Trim Materials: Selected according to erosion, corrosion, temperature and required control performance.

Electric Control Valve Flow and Pressure Considerations:

Control valve selection requires consideration of the process conditions and required flow response.

• Flow Rate: Determines the required valve capacity and trim size.

• Pressure Drop: The available differential pressure across the valve influences sizing, trim selection, noise and potential cavitation.

• Temperature: Affects body, trim, seat and packing selection.

• Fluid Properties: Viscosity, density, vapour pressure and phase affect valve performance.

• Control Range: The required minimum and maximum controllable flow should be considered when selecting valve size and trim.

• Cavitation: Should be evaluated in liquid service where local pressure through the valve may fall below vapour pressure and subsequently recover.

• Flashing: Should be considered where the fluid remains partly vaporised downstream of the pressure reduction, requiring suitable valve, trim, material and downstream piping selection.

• Noise and Vibration: Should be evaluated where pressure drop, flow velocity or fluid conditions can produce excessive aerodynamic or hydrodynamic noise and vibration.

Electric Control Valve Standards and Testing:

Applicable standards may include:

• IEC 60534 – Control Valve requirements where applicable.

• IEC 60534-2-1 – Flow-capacity sizing.

• IEC 60534-4 – Inspection/routine testing requirements where applicable.

• ASME B16.34 – Applicable valve pressure-temperature/design requirements.

• ASME B16.5 – Applicable flanged connections.

Testing may include:

• Shell pressure testing

• Seat leakage testing according to specified leakage requirement

• Valve operational testing

• Actuator functional testing

• Stroke and position verification

• Full-stroke verification

• Position feedback verification

• Control-signal response test

• Modulating-position test

• Material verification

• Dimensional inspection

• Fail-position/function test where provided

• Calibration/positioning check

Electric Control Valve Applications:

• Process Flow Regulation – Flow control through process equipment and piping.

• Steam Flow Control – Regulation of steam supply to process or utility equipment.

• Feedwater Control – Regulation of water flow in suitable power and steam-generation systems.

• Pressure Control – Control of upstream or downstream process pressure according to the control-loop arrangement.

• Process Bypass Control – Modulating flow through bypass lines around suitable equipment.

• Chemical Process Flow Control – Regulation of compatible process fluids using suitable body and trim materials.

Share the required flow rate or Cv/Kv, inlet and outlet pressure, process temperature, fluid properties, required control range, control signal and fail-action requirement with Speciality Valve for Electric Control Valve sizing and selection.